Method of reconditioning paper surfaces



Patented Nov. 27, 1951 .METnonoF RECONDITIONING PAPER SURFACES 'John vlad and John R. Fisher, Jr.,,Dayton, Ohio,

. assignors to The Commonwealth Engineering Company of Ohio, Dayton, Ohio, a corporation 1 of Ohio invention relatest'o a process of reconditioning thesurface pfpaper and a composition Itli'er'efor, and inparticular toianinhibitor ofsocalled ghosts on"'blue prints, photocopies "and other kinds of reproductions.

Documents, drawings, letters or the like very often have marks thereon which either are caused by papers having been folded, by surface erasures or other similar procedures which affect the surface of the paper. Such surface flaws impair the appearance of the papers, and furthermore in the case that blue prints, photostatic copies or other reproductions are made thereof, such flaws appear to an exaggerated degree on the reproduction as a ghost and consequently spoil the picture.

It is an object of this invention to provide a composition and a method for removing from paper surface flaws such as those described above.

This and other objects of the invention are accomplished by treating the paper at the spots having the flaws with at least one organic compound selected from the group consisting of clear light oil material, glycerols, glycerol ethers, glycerol esters and hydrocarbon solvents. In the following a few examples are given which yielded satisfactory results.

Example I Parts by volume Kerosene 50 Carbon tetrachloride 50 This mixture was applied to the paper at the location of the surface flaws and the excess thereof then removed by blotting. The marks had practically disappeared and a reproduction of the paper was free from ghosts.

Example II Parts by volume Blown castor oil 35 Methyl alcohol 65 Carbon tetrachloride 50 This mixture was applied by the same method as in Example I. Also here the results were satisfactory.

" No Drawing. Application May 1, 1946,

-' s Serial No. 666,539

The method of applying this mixture was the same as described in connection with Example I. This mixture of Example IV yielded by far the best results, since it left the paper without any marks after drying and removed every trace of erasure or crack or other surface flaw. Thus, reproductions made of a paper treated with the composition of Example IV, were entirely free from ghosts or the like.

The mixtures of Examples V and VI were found to be especially satisfactory for reconditioning bond paper on account of their non-grain raising property. However, they are also 'applicable for other kinds of paper, such for example for vellum paper.

The composition and method of our invention is applicable for all sorts of paper, such as bond paper, vellum paper or the like.

,For reconditioning the surface of vellum paper a solvent alone is sufficient to obtain the desired efiect, since vellum paper is coated with a plastic material which is soluble in hydrocarbon solvent. For bond paper it is preferable to apply a mixture of an organic compound selected from the group consisting of clear light oil material, glycerol, glycerol ether, or glycerol ester and a. hydrocarbon solvent therefor. As was set forth above a mixture of glycerol and ethyl alcohol yielded the very best results. In particular 20 to 50 parts by volume of glycerin and 80 to 50 parts by volume of ethyl alcohol were found to be preferable, and a mixture of 35 parts by volume of glycerin and parts by volume of ethyl alcohol proved to be excellent.

The composition used for the process of our invention may be applied with a glass rod or a brush. As described in the examples, it is advantageous, though not obligatory, to remove, immediately after application, any excess of the reagent, for instance by means of blotting paper.

It will be understood that while there have been described herein certain specific embodiments of our invention, it is not intended thereby to have it limited to or circumscribed by the specific details given, since our invention is susceptible to certain modifications or changes which come within the spirit of the specification and the scope of the appended claim.

We claim:

In a @ethod :pf reconditioning the surface pf a substantially uniform appearingopaque'writing paper having a flaw thereon rendering a portion of the surface non-uniform appearing, h s ps of applyi to h said-panel al i t aisi flaw only a mixture consisting of approximately 35 parts by volume of glycerin and approximately 65 parts by volume of ethyllalcphofl, arifd'thereafter drying the said paper be -Q1273 5th? 5315411118715 is caused to disappear and the paper attains substantially the original overall uniform appear- 15 ance.

JOHN VLAD. 7 JOHN R. FISHER; an.

nennmaivons ;GI'-1-ED "The fo'lloyving references are 'of record inthe Lfi TOT th s il'iiate UNITED STATES PATENTS Number Name Date.

597,806 Marangolo Jan. 25, 1898 134M3 1 sehwenterley a. V Mar. 6, 1923 1,46414737 K. 1ementv Aug. 7, 1923 1,744,767 Huisken Jan. 28, 1930 2,102,506 Bland Dec. 14, 1937 195,689 Bash Apr. 2, 1940 25238345 "Fulton Apr. 15, 1941 "2,249,800 Weber July 22, 1941 523243118 Johnson July 13, 1943 '2,'405;20 9 ii-Terry .7 Aug. 6, 1946 FOREIGN PATENTS Number Country Date A3428!) Great Britain Apr. 12, 1937 OTHER REFERENCES International Critical Tables, vol. 3 1st ed.

4192a). -11- 300, ublished by McGraw Book 

